IDOJ).] PUBLIC DOCUMENT — No. 31. 119 



acids, with iodine munbcrs of 8i).0G3 and 181.22, respectively, 



then : — , ,,^.^„ 



X + y = . 802G 



89.963 x+ 181.22 y= 130.77 



X = 16.08 per cent, oleic acid. 



y = 61. 18 per cent, linolic acid. 



The above results indicate that there is approximately fonr parts 

 of linolic to one ])art of" oK'ic acid })resent. 



The soluble fatty acids as determined by difference — total 

 05.70 less insoluble 95.31 — were .39 per cent. The Reichert- 

 Meissl number was .19, which indicates a low volatile acid 

 content, thus substantiating the previous result. In both cases 

 the amount was insufficient to ])ermit an accurate determination 

 of the neutralization number and the mean molecidar weight. 



Soy bean oil is greatly affected by heat; if held at 100° C, 

 for several hours the chromogenic bodies are destroyed and a 

 noticeable percentage of the oil volatilized. Upon saponifying 

 with glycerol -sod a, the mixture takes on a dark red color, which 

 fades as the soaj) sets. 



According to the classification of Lewkowitsch, based on 

 iodine number, soy bean oil is a semi-drying oil of the cotton- 

 seed oil group. In composition it resembles cotton-seed, sesame 

 and corn oils. 



Our chemical data can be summarized as follows: — 



Saponification number, . 19195 

 Acid number, . . 1.27 



Ether number, . . . 190. 68 



99.37 per cent, neutral fat,' \ ^^ ^7 per cent, fatty acids. 

 ,/ 10.42 per cent, glycerol. 

 .03 per cent, unsaponifiable matter. 

 .63 per cent, free fatty acids. 



^ 39 per cent, soluble fatty acids. 

 .19 Reichert-Meissl number. 

 .11 per cent, volatile fatty acids. ^ 



„_ „, . 1 , 1 ( palmitic acid. 



95 31 per cent, msoluble \ -, • • i 

 ^ e , . , , { oleic acid, 



tatty acids, . j ,. i. • i 

 •' ' ( imolic acid. 



Neutralization number. 200 22. 

 Mean molecular weight, 280.48. 



1 The unsaponifiable matter is included in this percentage and in the resulting calcula 



tious. 



-- ('.ilculati'd from the Reichert-Meissl miinher and the neutralization numtier of the total 

 fattv acids. 



95. 70 per cent, total fatty 



acids, 

 Neutralization number, 



200. 57, 

 Mean molecular weight, 



279.99, . 



